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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec924c7a04650ecd09ac4c8df6222870603fccc0d73b5f2f1d6bcdf77a9f6b03' 
  AND token = 'ra/1VLFDpilNC55ee716VA16dQmkte9XOJhyHw3/cdY=' 
  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"
    }
  }
}