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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09bbd24b631b48e0c2c0ef62450e874d6d19951626580dfb8bc955923de266a2' 
  AND token = 'uE2e46dRqUjpqP6bpM74a/A4FqHFjtRgbKxI3tNs5+0=' 
  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"
    }
  }
}