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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7160dd5c39679eea1381c1cd1e421350454dd0dbaa7e0e8b6092904417db487e' 
  AND token = 'hSd5I+fjp12oM05FD3EFGd5ONumr70JgsisLHSDh7Vg=' 
  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"
    }
  }
}