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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0632ebf35306d9a63f90799902bda7430fb9534f5dfde029b7d4c8554e5738df' 
  AND token = 'lrIP5ml7w/s5BSWonHIh0xnmuT+F2cGW5VGFgvxLukI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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