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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a5512fd491b4fad525a2444268315855672563f828fe7aac95d159e7e908de' 
  AND token = 'MyJ4sIcRazzTA96cEx3XD2qgNfyq43Jad2OY8dYTbA4=' 
  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"
    }
  }
}