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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea78020b0c589d4f83cb22e9cf1614fff97f87fa1b5abc9a817ffda4d94139b' 
  AND token = '6SFjqTmpmd90iHn03bxHvv+R4ga9hNDnOXNcgMTpX/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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