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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '623c2bb04fbaf815f1769361e1da43c6cc1132d0422acef906aa85add2fff54a' 
  AND token = 'IpKpIKF2d5FmnK0VkFd1Jv1UV3gILbTKHfaeI5ym9pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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