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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bbce5797d246b25f5292f9d6fec2f26cccca04369bd96ff7b0c3e4c85280a9a' 
  AND token = 'TvyWe26/+hAkm7H3pvJl+iI+Ds4k7+2w2JCiaUti9BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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