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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bbadc161a3b84d45477198f4a29fa8b3f05e12ab78d895e6919ccd8542763cd' 
  AND token = 'AddDZ50ulD5ArJWIPLru41UkkzwN+unX8wn1Znhs+2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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