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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c76633ca571c87399e2d0cfcdaf73dad8273b4948ea6bb58778085fe70c038ca' 
  AND token = '4dwbIUAKn1u1NUabWR8H8WcCxMj7R/lkS02SUQp/88Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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