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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ef7add20ac58ece6f70c97dc0eb2aded79f66e91f5b4dc05dd199ed4ba5608' 
  AND token = '1iozYkBescNrdeHS6aIwRNI55Q/q1bIwy1A0t6Mt2DI=' 
  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"
    }
  }
}