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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9a9c87818114b0b3dafc22362e164a920edb8aae11a4370fd60cebc091c8bc' 
  AND token = 'QNIVWoLK840kZ8sKS7+hCzDEnRPGFFkNDn55Wd4VJRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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