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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11aadf72fc4bd186b51a8d6bbd90c8c95f444331537a80c54a9abb323b30e28' 
  AND token = 'bEfSjKq3pvE57E61EwAc0TyIlGGmDG+DA84M7yscQ5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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