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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94dc91df0e50c673186e7c8f2133cb992c9ce59695ab7266083668ffbb5d3833' 
  AND token = 'hZB8iWv74tOW/DSMcvRt9neJ3GDX6QWEmmV9fAoT3Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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