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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa19f70831ead4fb59851dd5f50ac3f5513f3cb8739b1cbcb1b63ddffb4e1d10' 
  AND token = '8THwm7dJlv2wWS/1RZtTmeW2ECRhaV8dfpyol5yrM00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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