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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27ba3a67478126ba4df6857d5ebba2d4d2209d90ceb8b39b2a21410b4697b2e9' 
  AND token = 'xOlHBxr0Rn8AduLoXQ+hnUsPe8LYt/HDw3S5eKkp8CI=' 
  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"
    }
  }
}