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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3136c24dfadaf8e3390f3c554f8e7f427c44b1737ccbbb173342ce280a02eb91' 
  AND token = '6jgOvrKrtM+TzkFMYuPVU1LbGxk3NCS0r4j+WRKEciM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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