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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f827af16eca89c3f02204094913b1e903504822bfbd43d166340cc4c76a218' 
  AND token = 'x7enodMBITiSxHSeZYy9FNdnAnEHiys0/gH9lWiAg6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}