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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d9037a2576c72c03a6debbc4d3b96af0e9ee1e460a9786d4b68ab63b612e8e' 
  AND token = 'I9qCSMzZllCIo64XeFTc8qHTCM736Z4f5oJUG4+JTrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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