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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e2b935701e5d78308154d5134091f0eb56b3c20d4193d3d3f0b7a1780ac651' 
  AND token = 'oiThFmtNQb69qIyy6AzQ5V+r0EvWeF62YA7sQNFy2Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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