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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c90e33b2cc26bca5a3c7beb5307b215eefc618c99b44b58b32ab7a31dc2095' 
  AND token = '9uM+8oLCoABtxJe/ATJWAyeUCgh/FDLxXctDme6zPCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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