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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5972386e42eb24bc23c69028f5507f603ef3ec442dff683c362b1d232e4f53' 
  AND token = 'aVH6dRPEO0atWletzp+Pd1gQo9xvB+JuAD60nKTPCIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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