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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ff1c2b69e99f7d166a604815f2a862b5b2cbb36ff2d346d025c88571c7f4d6' 
  AND token = 'fX0Olnf0sbpX0IMeuWobITGm8tfrA+IBFIv+wVZZfLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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