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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099321fe6d946b0aca3f91d9b6d8de39e273145ea7cac6cc254f86a204e43f30' 
  AND token = 'diV07iBiX3yCvMhPVnT/3pqlyMBxcT2f+bCJN4AQ3+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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