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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8a50bbc28f37a6f74cfbc1f2bff841c9cc534bd6d766baa1a6981b7b2efc32c' 
  AND token = '77WRJSZuaOvbp3WuvN6gWBHONz8DE/VEWPKi8Be7YI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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