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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8da554235b33232f0aae415ef7499b0863b844838fdc0afd3b6efc0cb531fcbd' 
  AND token = '9XgwzT6EtuiyZt95EdGyHyiI7nDLfCq4OxzMzWjGLJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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