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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42c844dc3e2f3c79e7ee3deca4269b01e3d0114d52a07c2bb04c7a2d41ee6e09' 
  AND token = 'OD/0wxsJrvIHpQwt8o3UptiTdR8BwdBsfEoprd59qv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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