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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a317e38f8ba899e8f84c7eb66d29620c5c35bbec4cc975c14b0b20035f5743c4' 
  AND token = 'PIx/l1hZbx0D1s4NnyUQLP0QCcZR9652BIOyCn2rJlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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