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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20915d494a3b0b1de9cf12b254d92db0349ff5bf1f0864ecba7513a5b51073c9' 
  AND token = '70nGLGMkUiyty3C4gP+gD0K7m9u6jCem+dgh9Fstscc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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