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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b2230d4a11308ce8e0dbc9b761b7ed2e5ab1703d44f9fca53f3669fc2e0a18' 
  AND token = 'QuH8ehgSTgLmlIhtvvg2A/s92kfhP5EVW1IAZRs3MhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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