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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf930059139c91c94fd49e5eb5b8257d1ebfdd507d96f086f7fb19f2fbf4db29' 
  AND token = 'tHMw5Hqcf0QqtzzHIie0sXp1SlANQFWG7n0PNb4aDAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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