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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b80814dc9db14ca14ede56b18c52d44d50754ab1285805147f9d108bb9608175' 
  AND token = '18Zg/2GWoaC2Y8CM1d9TkjJxXhPtk4zaHApPKHq6/Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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