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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8acadfc0f4479256d57e5ea63125addb21ebb47c94cc94539b4e3fae70f35b' 
  AND token = 'wWjrsyIE8m7GUrS5o+9cvmIMP1ZjkHYNKAM+twFoL20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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