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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf93b45b4a86b8f21067eb71a445a83374b7cd40d6ef643e5b07d4b86f3ffde5' 
  AND token = 'p4srSaWR3HzHIwYDr2iBZHXsnt9Pd2Rs2MtuQfyFkMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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