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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411ae9b84dd13b1a4684d209b809b98b776bd6cdf465c71be335bb6a083a448a' 
  AND token = '+zp0d164Lx0AMKVcmwtSUOFC0+Ep1h0aq4NEdHtebyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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