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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d104fd902931a4e23cc405956e8ab2eea7f199b06e057178a3ae621fbf64ee7' 
  AND token = 'x8xKX4y68XKXEKKo65KDaDesBIrzzIAlf2OK3AH1aTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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