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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44b3917b08e29512392d0b4089d62c5cad6806305d4ac9d3a0b35d20747787c1' 
  AND token = 'l7VK7JO8f5cq5l14yhOZghYYKmB6sZZ0DTtON9t3jAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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