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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c136d69c81132f46d968cb0ecfdb831e0c01ad94eb1bb578ac809a7b82a5bb67' 
  AND token = 'FhJxz1Ig1B9MeyEUfrcCAN/oYzXqh8qM7gk926oIB88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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