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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee8d1f9e0c2aeec3ef4d5686b25f3803293a8d5156b3b78fc00007175efda6b' 
  AND token = '0uV+XMuYHwj8eIauxobYmTkQgRUVzsWlfIIG+/2DNPA=' 
  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"
    }
  }
}