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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65f88e8d52e0e69371f29cb9d6b71b1529dd199ed21cb5751e8322bd10031a2a' 
  AND token = 'x/2+rXi0ArSt+mKYK3R+i2QnVGlY5V2/ODR/9uS0pKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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