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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb4aa620219140cd0508b734244c38a68ca81a27991412f8467c0b693373bdf' 
  AND token = 'iX9Vz7unRacdEF5Kw4hAryiuRelEQ/hfXDW/Oh6yRiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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