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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dddb8556accda759468945240053e283667d0a5b019ed3eedb6c526f185a03d' 
  AND token = 'Rd0LejJncp0ZlO/Ss9rw0ujXacI9NiLbhCLchSoE3LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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