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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f40d7b0a7d5aa9f75b5c3dafe6436f6c920220f49a29f1ee35e4d4e05f2ae50' 
  AND token = 'RBWYRcvB8u7Y2H+rPaYQPvx0ohuKt3/z3syzlYXfJ4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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