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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '653e0dd8dcf26bec0088decf5c3386febd72648154eb2d5b38c66a5f9d4d1ab6' 
  AND token = 'FOHA9wwiaBIVk+Z8v58OwgefGPMNA8Xc2qH1V2Faam8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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