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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa0b377bbd39a81392a5e226dbe94948b0dd4f7b2bea60f12d96af467ce450f9' 
  AND token = 'qunvL8BipspPDtFNR/fqY1OJgk4tcDCCM8S/XBh/s4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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