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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78c15b6787b6ecc77609b509c109a32ca443621888f7bd786e3f9e2de09f13b9' 
  AND token = 'pJWUBIQasVxyURzfAposLSJ8ep4Tghl3OxUC6mQHA1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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