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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f5df6c857ab337dbf0e1b5d1b019472e8a3088edc0f5ba168633a63dd64fa2' 
  AND token = 'wjmi+haTZEb2r4oXs+2NOxRuiukWbNoMnnsxB7YvGrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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