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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b54f6e32f811dc4a90000d99006f3a6913d55f4496f2416a073d6c7204e61d86' 
  AND token = '1A44Uk6cH1LhBNQzxK8HAlef3PQ9l0Do6gMhmrUpt3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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