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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3bcfbbfa855bf42ab51451da26294c934608a3c35f98ecae5ce828348f7088c' 
  AND token = 'zR+d6+4R5hLwNbgmBELpvwOmjz2qRUhlfNd93X9CabE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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