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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20609a0134afb0e6056f9e679be354f7f967b9848096d6e9db00d294fc89aeeb' 
  AND token = 'k9z00RsuPOjhGwokaxJM1Ue+GZn3ZGLbeSQXgs4WejI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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