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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0b93a5e47c8e5e06da0b2a0baf227ade9bbcd5aedc72cdffd66554815b0a32' 
  AND token = 'X911scMSk65qNG80D4ZPUml0urKHdrnTjVxj3Tb01rI=' 
  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"
    }
  }
}