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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac45fa44651617727b42f4ce0f3c6adfc52eb848773bee29ddc42c2bf9586619' 
  AND token = 'tWb6lWQTTQAmJ9he+0qmW8lyxPX9D1xlB8npZDOAuTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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