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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a27dc03be64cc3ccc7b9f6c697316fbb8cffbb2afd3b12518db94a100c1f2c' 
  AND token = '+1OR8+S3DmYZL75zeH6oDeZvI2Dfx9z5B6AR+/QDByE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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