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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3799ef2e2a19aa80cd092384ef9a2288a1dff07ce9d1636690afe773cad7fca' 
  AND token = 'fAE8j/H/puZdOb/9L6EiLTm5fhVdjI6oEVMQq+NgOUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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