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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f180844de0d6fda323225c0aa60062ac124825afd748ac96eb7e4f0041731490' 
  AND token = 'IQyzCFI0EyA4jMa3GFg164Kzqjzw7Tu1PIGVso2TSQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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