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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7204e15ebcabac83f7d6b1af05315a8e062bae99a9d507e44b478a85f3fee631' 
  AND token = 'g7bdyVCL0x6wqvHLX1AWIF1mSssrH6mN24GV65HDWHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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