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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe9868d3ecbfa7af98422470513222babacc92210d9b4e4fe43c609dd2d6ed7c' 
  AND token = 'OoYnPg5rYeyH5XIkOQXkIkzY4/A3SbIGVoIOuTVyojs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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