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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '298bad6dcfa7382ffd35a47440d55845a41942eb76d0354aa07219c53b0c5a05' 
  AND token = 'Y/Xchah+cszHbVO4liPrvwQK39kOM3C1K1gUHX7f4mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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